Equity (Reclassifications Out of Accumulated Other Comprehensive Income (Loss)) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other net investment gains (losses)									$ 327	$ (35)	$ 88
Net derivative gains (losses)									(3,239)	(1,919)	4,824
Net investment income									22,232	21,984	19,585
Other Expenses									(16,602)	(17,755)	(18,537)
Other-than-temporary impairments on fixed maturity securities									(106)	(346)	(924)
Income (loss) from continuing operations before provision for income tax									4,052	1,442	9,184
Provision for income tax expense (benefit)									(661)	(128)	(2,793)
Net income (loss)	916	975	510	992	136	(957)	2,303	(120)	3,393	1,362	6,415
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income (loss)									439	151	(432)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Investment Gains (Losses), Net of Related Offsets [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other net investment gains (losses)									404	(34)	(952)
Net investment income									93	73	73
Income (loss) from continuing operations before provision for income tax									411	58	(766)
Provision for income tax expense (benefit)									(136)	(23)	261
Net income (loss)									275	35	(505)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Other-than-Temporary Impairment [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net derivative gains (losses)									(26)	(10)	144
Other-than-temporary impairments on fixed maturity securities									(60)	29	(31)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains (Losses) on Derivatives [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income (loss) from continuing operations before provision for income tax									36	24	(21)
Provision for income tax expense (benefit)									(11)	(8)	7
Net income (loss)									25	16	(14)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains (Losses) on Derivatives [Member] | Interest rate forwards [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net derivative gains (losses)									10	1	31
Net investment income									3	2	1
Other Expenses									(1)	(1)	(1)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains (Losses) on Derivatives [Member] | Foreign currency swaps [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net derivative gains (losses)									(3)	23	0
Net investment income									(3)	(5)	(6)
Other Expenses									1	1	2
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains (Losses) on Derivatives [Member] | Credit forwards [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net derivative gains (losses)									0	0	2
Net investment income									1	1	1
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains (Losses) on Derivatives [Member] | Interest rate swaps [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net derivative gains (losses)									20	1	(42)
Net investment income									8	4	1
Other Expenses									0	(3)	(10)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Defined Benefit Plans Adjustment [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of net actuarial gains (losses)									283	252	237
Amortization of prior service (costs) credit									(69)	(98)	(104)
Income (loss) from continuing operations before provision for income tax									214	154	133
Provision for income tax expense (benefit)									(75)	(54)	(46)
Net income (loss)									$ 139	$ 100	$ 87